ICND2: VLans on a 2950

Node Man

Hi Everyone,
Can a 2950 only have one Up-Up vlan at a time? Whenever I no-shut one vlan, another one goes admin-down.

Please advise.

Thanks!

mikeybinec

There is a thread about this somewhere else, but yes, only 1 interface VLAN can be online.

You can have many access VLANs that you can assign to various switchports, but as for your
management/native vlan (or SVI) only one can do.. I've done that before: Make two diff interface vlans , and one would shutdown and the other would come up, etc etc.

A Guru probably can explain this better than I

networker050184

mikeybinec wrote: »

You can have many access VLANs that you can assign to various switchports, but as for your
management/native vlan (or SVI) only one can do..

Just to clarify, this has nothing to do with the native VLAN. You can only have one SVI in the up up state.

OfWolfAndMan

L2 switch SVIs are strictly used for remote management. Multiple SVIs are used on L3 switches only and allow virtual gateways for downstream devices configured on that VLAN. FYI you can remote into a L3 switch from any of their SVIs (Whatever their IP address for that SVI is). As for the native vlan (Which is defaulted to 1) is the VLAN that isn't "tagged" when being pushed across the trunk (Which carries all vlans through it, assuming you haven't pruned any). This traffic can communicate with every other VLAN (Which is how VLAN hopping occurs).

Hopefully that answered your question.